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Mystery misfiring at cold start

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Original source

3 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHMystery misfiring at cold start

Reported or suspected cause

afm - car went stonkingly well

Reported cause

No successful repair reported for this finding.

1
Identified cause: 0
Suspected cause: 0
Reported fixes

Read evidence and context

Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that report identifying a cause: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Reported cause
I had a funny cold misfire/stutter with my 986 and it was the AFM - car went stonkingly well when it was swapped out.
Original post Read captured discussion
Mystery misfiring at cold start

Frequently discussed work

Check air flow meter readings

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion
Check the air flow meter readings with PIWIS.
Original post Read captured discussion
Mystery misfiring at cold start

Read full discussion summary

Leading evidence: 'afm - car went stonkingly well' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'afm - car went stonkingly well' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Check air flow meter readings' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.

Read captured replies

1 matching discussions · 3 captured posts examined · 0 partial discussions

Compare 2 other evidence results

Check air flow meter readings

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion
Check the air flow meter readings with PIWIS.
Original post Read captured discussion
Mystery misfiring at cold start

Check ambient temp, speed, injector pulse width, ignition timing etc

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion
The service manual gives you a load of parameters to check - ambient temp, speed, injector pulse width, ignition timing etc.
Original post Read captured discussion
Mystery misfiring at cold start

Frequently discussed actions (2)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Check air flow meter readings

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion
Check the air flow meter readings with PIWIS.
Original post Read captured discussion
Mystery misfiring at cold start

Check ambient temp, speed, injector pulse width, ignition timing etc

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion
The service manual gives you a load of parameters to check - ambient temp, speed, injector pulse width, ignition timing etc.
Original post Read captured discussion
Mystery misfiring at cold start

Reported and suspected causes (1)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

afm - car went stonkingly well

No successful repair reported for this finding.

1
Identified cause: 0
Suspected cause: 0
Reported fixes

Read evidence and context

Discussions that report identifying a cause: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Reported cause
I had a funny cold misfire/stutter with my 986 and it was the AFM - car went stonkingly well when it was swapped out.
Original post Read captured discussion
Mystery misfiring at cold start

Coverage and how to read this overview

Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.

3 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

911uk: 1 discussions

0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.

0 acknowledgements have no verified action link; they do not establish a repair result.

Generation: 20261026T220748Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Posted this in the Boxster/ Cayman forum, same engine vintage so ideas welcome ... :thumb: http://911uk.com/viewtopic.php?t=131035&start=0&postdays=0&postorder=asc&highlight=

POST 2Original post

Check the air flow meter readings with PIWIS. The service manual gives you a load of parameters to check - ambient temp, speed, injector pulse width, ignition timing etc. I had a funny cold misfire/stutter with my 986 and it was the AFM - car went stonkingly well when it was swapped out. Used to get Lambda sensor/adaption codes on it after a longish run, but didn't get a CEL.

POST 3 / ORIGINAL POSTEROriginal post

Thanks for that, another great suggestion to look into, just what I wanted.

This is a source reference. Confirm exact model applicability in the original material.